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u in (-oo:+oo)
(-4/3)*u+2/7 = (-1/7)*u+3/7 // - (-1/7)*u+3/7
(-4/3)*u-((-1/7)*u)+2/7-(3/7) = 0
(-4/3)*u+(1/7)*u+2/7-3/7 = 0
-25/21*u-1/7 = 0 // + 1/7
-25/21*u = 1/7 // : -25/21
u = 1/7/(-25/21)
u = -3/25
u = -3/25
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